minecraft
For the boost in Minecraft Earth, see MCE:Boost.

Health Boost is an unused status effect that increases a player's (or mob's) maximum health.

Effect

Adds 4♥♥ maximum health per level. Unlike Absorption, the added hearts are empty at first, but can be healed through the usual methods (such as natural regeneration and the Regeneration and Instant Health effects).

Actual health may be above the base value after the effect ends and are not capped, unless the entity is healed. Extra hearts of a mounted mob can be seen while riding it.

Re-application of the effect when it is still active empties the hearts added by this effect.

When the effect ends, any extra health is lost.

Immune mobs

Boss mobs are unaffected.

Data values

ID

Java Edition:

NameIdentifierNumeric ID Translation key
Health Boosthealth_boost21effect.minecraft.health_boost

Bedrock Edition:

NameIdentifierNumeric ID Translation key
Health Boosthealth_boost21potion.healthBoost

History

This section is missing information about Legacy Console Edition. 
Please expand the section to include this information. Further details may exist on the talk page.
Java Edition
1.6.113w23bAbsorption JE1 BE1 Added Health Boost.
Normal Golden Apples now grant 1:30 of Health Boost.
13w24bNormal Golden Apples no longer grant Health Boost, instead granting Absorption
1.915w49aHealth Boost JE2 BE2 The effect icon texture of Health Boost has now been changed.
1.1418w43aHealth Boost JE3 BE3 The effect icon texture of Health Boost has now been changed, once again.
Pocket Edition Alpha
v0.11.0build 1Absorption JE1 BE1 Added Health Boost.
Bedrock Edition
1.8.0beta 1.8.0.10Health Boost JE2 BE2 The effect icon texture of Health Boost has now been changed.
1.10.0beta 1.10.0.3Health Boost JE3 BE3 The effect icon texture of Health Boost has now been changed, once again

Issues

Issues relating to "Health Boost" are maintained on the bug tracker. Report issues there.

Trivia